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Real Applications

7 Real Applications

The following examples are based on applications where Siemens Drives have been successfully applied. In some cases the circuitry and parameter settings have been simplified. The settings and parameters refer to Siemens MICROMASTER MM420s.

7.1A Simple Fan Application

The Application uses a MIDIMASTER to control a ventilator fan in an application where the fan is manually adjusted. By using the Advanced Operator Panel, mounted on the cubicle door using the appropriate mounting kit, a simple control solution without additional cabling is achieved. The operator can then adjust the fan speed to suit ventilation requirements simply by pressing the buttons on the panel.

7.1.1Advantages.

·At frequencies below 50 Hz there is significant energy saving. Power is proportional to the cube of speed, so a reduction in frequency to 45 Hz will result in a saving of about 30%. Mechanical systems offer little or no saving.

·Acoustic noise is reduced when the fan is run below base speed.

·The complete assembly can offer IP54 protection when the MICROMASTER is mounted in a suitable cubicle.

·The Advanced Operating Panel (AOP) offers a simple control solution; panel labelling, additional switches etc. are not needed.

·Closed loop control can be easily enabled using on board PI controller.

7.1.2System Specifications

Motor:

 

 

 

18.5 kW 400 V 3-phase induction motor

Control System: Advanced Operator Panel (AOP)

Drive:

 

 

 

MICROMASTER MM420 11 kW 400 V

Drive Control

 

 

 

Keypad control with start, stop and motorised potentiometer

Interface:

 

 

 

(reverse and jog functions disabled).

Advanced Operator Panel

MICROMASTER

 

 

 

 

 

 

(Door Mounted)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Supply and RS485

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Connection

 

MM420

 

 

M

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

11kW

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

U, V, W Output

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

and Earth

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3-Phase, 400 V

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Figure 7-1

 

Fan Application

 

 

 

 

 

 

MICROMASTER Applications Handbook

35